Calking gun and operating mechanism therefor



F. C. GOOD CALKING GUN AD OPERATING MECHANISM THEREFOR Original FiledFeb. 3, 1942 llllllll I;

.-HIII Patented Jan. 16, 1945 cALKING GUN ANDOPERATING MECHANISMTHEREFOR Frederick C. Good, PhiIa'delphia,Pa., assigner to Pecora PaintCompany, Philadelphia, Pa.

Original application February 3, 1942, Serial No. 429,363. Divided landthis application February 10, 1943, SerialNo. 475,327

claims. (c1. Vlr-169) The presentinvention generally relates todispensing devices and, more particularly, to hand operated pressureguns especially intended to dispense calking or similar material, thisapplication being a division of mycopending application Y Serial Number429,363, filed February 3', 1942.

l. rI rhe invention especially contemplates the provision of a pressuregun of the type specied hav mg a simplified yet rugged' operatingmechanism f including a slidable pressure creating member and manuallyactuated control means associated therewith and operable to impart apositive .thrust to said member for progressively advanc- A mg the same,thus creatingwpressure Within the gun for the extrusion of the calkingmaterial; to rigidly hold the pressure creating member in advanceposition, thereby maintaining the pressure created within the gun by theprogressive advancing movement of said member; and to irelease thepressure creating member for relieving the pressure within the gun andpermitting manual sliding of said member to retract it in activeposition.

Another meritorious feature of the invention resides in the provision ofa calking gun or like dispensing device wherein the operating mechanismconsists of relatively few parts` which may .be easily assembled andreplaced thus effecting a substantial saving in material and in the costof production and maintenance.

Other important objects and advantages of the invention will be in partobvious and in part pointed out hereinafter.

In order that the invention and its mode of operation may be morereadily understood by those skilled in the art, I have, in theaccompanying drawing and in the detailed description based thereupon setout a possible embodiment of the invention. 'l

In this drawing:

Figure 1 is a side elevation partly in section and partly broken away ofa modified form of the invention; l

Figure 2 is a fragmentary cross sectional View taken on line 2--2 of.Figure l;`

. Figure 3 is a fragmentary view showing another position of parts ofthe operating mechanism ,i1- lustrated in Figure 1. y l

Referring more particularly to the drawing wherein like characters ofreference will designate corresponding parts throughout, the calking gunshownbyway of example may bestated to comprisel a skeleton 'framedesignated in its entircty for clarity and convenience herein by thereference character 2U. AThis frame 2B is adapttion of said housing edto engage and retain in position a cartridge A containing the materialto be discharged. As shown in the drawing, the cartridge A is preferablyof cylindrical configuration and has at one endan annular open portionB, and slidably carries at its other end a movable circular cover Cwhich may serve as a piston to force the contents of the cartridge outthrough said opening B in ythe manner to be described more fully'hereinafter.

The skeleton frame 20 includes a body portion which may be termed thehead or stock. and which may be, and preferably is, constructed of'sheet metal stamped and bent into a shape vto provide diametricallyopposed walls 2| defining a housing 23 from which depends a pistol gripor handle 24. Upon the inner end portion of the housing r23 is mounted adisc 25 provided with a ilange 26 constituting a rigid and xed seat for'that one end of the cylindrical cartridge A carrying the movable coverC. The flanged disc 25 may be advantageously secured to said housing 23by means of lugs 21 formed with the endporto extend therefrom forpassage through -openings formedin said disc and riveted or upset overthe inner surface of the latter'as indicated at 28.

Located immediately below the flanged disc 25 and rlxedly secured to thelower inner end portion of the housingA 23 by means of fasteningelements, such as rivets 29 or the like, is a rigid bar 30 projectingfor a distance beyond said portion of the housing. v At the freeextremity of the bar B of the cartridge A,

3i! is mounted a combined nozzle and flange seat '3l adapted to receivethe open portion B ofthe cartridge A. The seat 3|has a depending lug orhingemernber 32 whereby said seat may be pivotally 'connected tosaid'free end of the bar 30 by ineans of a suitable centrally aperturedfor the passage of lthe extruded material, and carries a nozzle 35 whichpreferably is removable, whereby different nozzles of various siz'esland shapes may be interchanged. l v

For the purpose of maintaining the pivotal seat 3l in operative positionagainst the open portion there is provided a, lock bar diametricallyopposed end pivotally connected, as indicated at 31, to the upper innerend portion ofthe housing 23. The free end-of the lock bar 36 ispreferably shaped into ahook 3S adapted to snap over the outer faceofthe seat 3l which, for that purpose, is formed with a slightdepression 39 disposed to cooperate 36 disposed. in paralleling pin orrivet 33. This seat is f with said hook for assuring the lockingfunction of the lock bar 36. The lock bar 36 may advantageously beguided into its locking position by means of ears 40 preferably formedwith the seat or disc 3|.

Mounted to slide through the housing 23 and through the seat disc 25 isa notched or toothed piston rod 42 carrying a head or plate 43 whichengages the flanged cover B within the cartridge A, such associatedparts constituting a piston. The rod 42 passes through an opening 44 inthe seat disc 25 and is notched to provide teeth 45 which may beangular, and these teeth are engaged by an actuating pawl 46 pivotallymounted at 41 at the end of a trigger 48 which is pivotally mounted, asat 49, in the head of the structure. The pawl 46 may have a single toothor a plurality of teeth, as indicated. A detent pawl 50 is associatedwith these parts, being pivoted in the head, as at l, and as theactuating pawl 46 moves the rod 42, the detent will ride over the yteethof the same, then hold the rod against retractive movement as theactuating pawl returns for fresh engagement with the toothed rod. Thisaction is continued until the contents of the cartridge A aredischarged. The pawl 46 and 50 may be maintained in operative positionby the engagement of a suitable spring 52 hooked over the pivot pin 46of the trigger 48.

In a structure of this type, the operating parts4 are subject to wear,and the spring 52 is subject to stress and may, in time, requirereplacement. Tofacilitate repairs or renewals of parts or replacement ofa worn out or broken spring, removable screw bolts may be employed asthe ypivots 49' and 5ls such bolts being held in place bynuts 53. Inaddition, I may provide one or both walls of the head of the structurewith aper-r tures 54, such apertures being so disposed as to permitaccess to the spring 52, for instance, in case renewal is necessary.

Mechanism of this t'ype requires suitable means for holding the pawlsout of engagement with the toothed piston rod so that the latter may bereturned to permit insertion of a fresh container of calking material orthe like, and in the present instance, these means may be as follows:

The trigger is provided with a forwardly projecting spur 55 which may beintegral with the wall of the same, and pivotally mounted in the head isa dog 56 held by a spring 51 and anchored 'at 58 in such position thatwhen the trigger returns to normal operative position, as in Figure 1,'after an actuating movement, the end of the spur f will underlie andengage this dog, the two pawls 46 and 50 then lying with their operativeends in 51. When in the position shown in Figure 3, the detent 56 aswell as the actuating p-awl 46 will be held away from the teeth of therod and the latter may be retracted carrying the head or plate 43 withitand, when freed from the empty oartridge A and while still in suchretracted position,

a fresh cartridge may be applied.

- vUpon pulling back the trigger after a fresh container has beenpositioned in the gun, the spur 55 y of the trigger is carried away fromthe dog 56 and .j the spring 51 of the latter retracts it into suchposition as to' lie in the path of, and over, the spur 55 in the furtheroperation of actuating the toothed rod, as indicated in Figure l.

Upon reference to Figure 1, it will be noted that the under side of therear end of the detent pawl rests upon a portion of the wall of thetrigger, indicated at 59,-and that such end has a rounded surfaceportion disposed toward its pivotal connection. It will also be notedthat the rear end of the operating pawl 46 rides upon the top of a crossmember 60. When the pivoted dog 56 is placed in the position indicatedin Figure 3, the trigger is carried forward under the action of a spring6| interposed between the same and the pistol grip or handle 24, andthis causes the upper end of the trigger to retract and the rear end ofthe operating pawl will ride up over the end of the cross member 60. Atthe same time, the wall 56 of the trigger engages the rear end of thedetent pawl and moves the forward end of the latter out of engagementwith the teeth, as clearly illustrated in Figure 3. In the normaloperative position of the parts indicated in Figure l, the rear end ofthe detent pawl may rest on the cross member 58 to which the spring 5l'is anchored.

The head is preferably provided with ledges 62 and 63 which may becarried by plate sections 64 secured to the side walls 2l of the housingby welding or otherwise, and these ledges form a support for the toothedrod 42 to insure horizontal movement of the same in the operation of thedischarging the contents of the cartridge. In lieu of this arrangement,these ledges might be lpressed up from the side Walls 2l `of thehousing.

The dog 56 has side wings 65 which underlie and engage the under edgesof the side walls 2i and limit its retractive movement under theinfluence of the spring 5l, as illustrated in Figure 1.

In order to relieve back pressure upon the contained material, the dog56 may be flipped to the position shown in Figure 3, thereby permittingthe trigger to move forward, releasing the dogs and giving full reliefto the back pressure exerted by the material being extruded.

From the foregoing description, it will be apparent that simple andefficient means are provided for accomplishing the objects of the inven`tion, and while the elements shown and described are well adapted toserve the purposes f'or which they are intended, it is to be understoodthat the invention is not limited to the precise construction set forth,but includes within its scope such changes and modifications as may bemade within the terms of the appended claims.

What I claim is:

l. In combination with a frame structure having a grip portionand atoothed rod supported by said frame, manually operable means carried bythe handle portion for effecting movement of said rod, said meansincluding an operating pawl and a detent pawl in engagement with the rodfor the actuation thereof; a lever pivotally mounted in the handleportion, said lever having a grip portion complementary to said rstnamed grip portion and carrying the operating pawl, said lever beingprovided with means engageable with the detent pawl; and a dogassociated with said lever for releasing same to eifect disengagementand permitting the spread of said grips of said pawls with the rod.

2. In combination with a frame structure having a handle portion and atoothed rod longitudinally movable in, and supported by, said frame,manually operable means carried by the handle portion for effectingmovement of said rod,l said means including a detent pawl for the rod; alever pivotally mounted in the handleA portion; a spur carried by saidlever; and a dog associated with said spur to selectively control theextent of movement of the lever, said lever having a wall portiondisposed to engage the detent pawl and release it from the toothed rodwhen said dog is shifted to permit rocking of said lever. 3. Incombination with a frame structure having a grip portion, a toothed rodlongitudinally movable-in said frame; manually operable means carried bythe handle portion and including an operating pawl for eiiectingmovement of said rod; a pivotal lever for actuating said operating pawland having a grip portion; a detent pawl for the rod; a pivoted dognormally limiting the extent of movement of the grip of said lever awaynormal movement; a toothed rod connected to said piston; an actuatingpawl normally positioned for engaging said rod; a detent pawl normallypositioned for engaging said rod;' means associated with said actuatingpawl, detent pawl, and trigger whereby normal movement of the triggerslides said piston for subjecting the plastic to pressure continuouslyduring maximum movement of the trigger in one direction, and abnormalmovement of the trigger disassociates said piston from said detent pawland actuating from said rst named grip; and operating parts mounted inthe handle portion of the frame for moving the pawls by said lever awayfrom the c toothed rod upon movement of the dog from its lever-limitingposition.

4. In a plastic calking gun having a handle including a grip, a pistonoperating mechanism for said piston comprising: a trigger pivoted tosaid handle and having a grip with a normal movelment and an abnormalmovement away from said handle grip; means connecting the triggertocsaid piston whereby the normal movement of the triggerslides thepiston for subjecting the plastic to pressure, and the abnormal movementof the trigger grip away from the handle grip disassociates said pistonfrom said means; and means for normally limiting the movements of saidtrigger grip away from said handle grip, said last named means beingoperable to permit an abnormalv ing the plastic to pressure, and theabnormal movement of the trigger disassociates said piston from saidmeans; and a movably mounted dogl `operatively associated with` saidltrigger whereby the normal and abnormal movements of the trigger areselectively controlled.

6. In ay plastic calking gun having a handle and v fa piston, operatingmechanism for said piston comprising: a trigger pivoted to said `handleand having a plastic expelling movement and a normal retractile movementand an abnormalretractile movement; a toothedrod connected 'to saidpiston; an actuating pawl operatively associated with said rod; a detentpawl operatively associated with said rod; means associated with saidactuating pawl, detent pawl, and trigger whereby normal movement of thetrigger slides said piston' for subjecting the plastic to pressure, andabnormal retractile movement of the trigger disassociates said pistonfrom said detent'pawl and actuating pawl; and means for selectivelycontrolling; the normal and abnormal retractile movements ofsaidtrigger. y

7. In a plastic calking gun `having a handle and a piston, 1 operatingmechanism for saidr piston comprising: al trigger pivoted to saidhandleand adapted to have a normal movement and an abpawl; anda m-ovablymounted dog operatively associated with said trigger whereby the normaland abnormal movements ofthe'trigger areselectively'controlled.

8. In a plastic calking gun having a handle and a piston, operatingmechanism for said piston comprising: a trigger pivoted to said handleand adapted to have a normal movement of a predetermined extent and anabnormal movevment ofan extent greater than the extent of the normalmovement; and means operatively asso-y ciated with said piston andoperatively associated with a `portion of said handle and a portion ofsaid trigger whereby the normal movement of the trigger slides thepiston for subjecting the` lplastic to pressure continuously duringmaximum movement of the trigger in one direction, and the abnormalmovement of the trigger disassociates said piston from said means.

n 9. In a plastic calkinggun having a handle and a piston, operatingmechanism for said piston comprising: a trigger pivoted to said handleand adapted to have a normal movement of a predeate said actuating pawlfrom said rod, said trigf ger adapted, when abnormally moved, tooperatively move said actuating pawl into engagement with saidelement-and said trigger having a part stationary with respect to saidtrigger and engaging said detent pawl to disassociate the detent paWlfrom said rod.

10. In a plastic calkingvgun having akhandlev and a piston, operatingmechanism forsaid piston comprising: a trigger pivoted to said handleand adapted to have a normal piston ,operating normal andabnormal'movements thereof, said trigger adapted in its normal movementto actuate said actuating pawlfor the movement of said rod, and in itsabnormal ymovement to disengage the detent pawl from the rod and engagesaid element with said actuating pawl to disengage the same from saidrod.

FREDERICK C. GOOD.

